chesteb



(No Model.) 2 Sheets-Sheet 1.

W. P. CHESTER. a ELECTRIC BURGLAR ALARM ATTACHMENT FOR AUTOMATICSIGNALING APPARATUS. A

No. 280,578. Patented Jul 's, 1883.

b: Attdrm gr phar Wasmngton D C (No Model.) A 2 sfiet'hsheen 2.

' W. P. CHESTER.

ELECTRIC BURGLAR ALARM ATTACHMENT FOR AUTOMATIC SIGNALING APPARATUS. No.280,578. Patented July 3, 1883.

ax a

mill/[M T'- 21 w I "A" Zliziumzmx': znvcni'ar: v M Zflz'lh'aml 67m?UNITED STATES PATENT OFFICE.

WILLIAM F. CHESTER, OF NETV YORK, N. Y.

ELECTRIC BURGLAR-ALARM ATTACHMENT FOR AUTOMATIC SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 280,578, dated July 3,1883.

Application filed March 24,1883. (X model.)

T0 at whom it may concern Be it known that I, WM. F. CHESTER, of NewYork, in the county of New York and State of New York, have invented anew and ImprovedElectrieBurglar-Alarm Attachment for Automatic SignalingApparatus; and I do hereby declare the following to be a full, clear,and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, and to thefigures and letters of reference marked thereon.

My invention has for its object, primarily, to extend the usefulness ofthe district-messenger system now in such extensive operation in theprincipal cities of this and other countries by combining with theautomatic signaling mechanism employed in such system at each station orcall-box a normally-open local circuit, including a battery and anelectro-inagnet, extending throughout a building or other place, to beprotected and arranged so as to be closed by the opening of a window,door,

' tion.

or blind, or by the unwarranted interference with or trespassing uponany part of the building or place to be protected, and the electromagnetincluded in said circuit being adapted, upon the closure of the circuit,to actuate the tripping device of the signaling mechanism and set thelatter in operation to turn in a .signal at the central office; and itfurther has for its object the provision of meanswhereby upon thesignaling mechanism being set in operation the local circuit will beautomatically opened, soas to prevent wastage of the local battery.

The novel features of my invention will be first described, and thenpointed out particularly in the claims at the end of this specificaReferring to the accompanying drawings, Figure 1 represents a frontelevation of a district call-box containing an automatic signalingmechanism and showing the application of my improvements thereto. Fig. 2is a sectional view taken on the line 00 00, Fig. 1. Fig. 3 is asectional view taken on the line y Fig. 1; and Fig. 4., a detail view,showing the gearing of the signaling mechanism.

Similar letters of reference inthe several. figures denote the sameparts.

The letter A indicates a metal call-box, containing the signalingmechanism and other operative parts.

B represents the main actuating-shaft of the signaling mechanism, uponwhich is mounted a disk ordrum, 0, having a peripheral tooth orprojection, a, and a peripheral recess or notch, b, and upon which isalso mounted a volute spring, D, and a gear-wheel, E, one end of saidspring being connected to the shaft and the other end to astationarypart at c, and the conneetionbetween the shaft and the gear Ebe ingeffected by means of a ratchet and pawl, (not shown,) so that when thegear E is held from rotation, as hereinafter described, the spring canbe wound up by the application of a key or crank to the outer end oftheshaft D, andwhen, on the other hand, the wheel E is released, thespring will rotatethe shaft and the disk 0 thereon in the directionindicated by the arrow, Fig. 1. The gear E meshes with a pinion, F, on ashaft, F, which shaft also carries a circuit-breaking disk, G, at itsouter end, and a gear-wheel, F which meshes with a pinion, H, on a thirdshaft, H, that also bears an escapement-pinion, H with which engages anordinary escapement, I. This arrangement of gearing is such as iscommonly employed in devices ofthischaracter, the object desired to beaccomplished by it being the gradual rotation of the shaft B and itsdisk 0, as well as the gradual rotation of the circuit-breaking disk Gon the shaft F, when the unwinding of presently be explained.

G is a tripping-lever, pivoted at g and having its upper arm,- G-,extending upward and adapted to be normally projected into the recess ornotch 12 in the rim 1) of the disk 0, and having projecting from itslower arm, G, below its pivot, a stud, G". A spiral spring, G operatesto pull the lower arm of the lever forward and to keep the stud G* inthe path of a stud, G, projecting from the side of the disk G. WVhen themechanism is wound up by the rotation of the shaft B, as aforesaid, theend of the upper arm, G", of the lever stands projected through therecess or slot in the rim of the drum C, while the stud G on the lowerarm of the lever rests under the stud G on the disk G, thus preventingthe rotation of said disk G, and consequently the rotation of the wholetrain of connected gearing. When, however, the lower arm, G", is fromany cause swung outward, the end of the upper arm will be withdrawn fromthe slot or recess in the the spring is permitted to take place, as willrim of disk 0, and the stud G will release the stud G and allow thetrain of gearing to be set in motion. As the disk 0 revolves the end ofthe upper arm of the lever will bear again st the under side of the rimof said drum, and there remain and slide in contact until the slot orrecess in the rim again comes opposite, whereupon the spiral spring Gwill pull the lower arm of the lever forward, thereby causing the end ofthe upper arm to pass up into such slot or recess, and the stud G toagain move into the pat-h of the stud G and stop the further motion ofthe mechanism.

J is a metal finger supported on an insulating-block, K, and adapted tobear lightly upon the periphery of the disk G. The main signaling-cireuit (which is a normally-closed one) comes in at binding-post1, passes up wire 2 to the metal finger J, thence to disk G, thencethrough the connected metal parts of the mechanism to the metal casingA, and thence out at terminal or binding post 3, connected to the metalcase. It is obvious, therefore, that when the drum G is rotated themain-line circuit will be broken and made as many times as there arenotches in said disk, for as the metal finger reaches each notch itspoint will drop down into said notch and cause a break of the circuit,while upon the engagement of the spring with the disk beyond said notchthe circuit will be reestablished, and so 011, the makes and breaksbeing repeated until the spring finally rests upon and in electricalcontact with the smooth unbroken portion of the periphery of the disk.

N and 0 represent two metal spring-arms mounted upon aninsulating-block, P, andhaving a tendency to spring apart at their freeends, so as to keep out of contact with each other. From spring Nextends a wire, 4, to an insulated binding-post, 5, and from thespring-arm 0 extends a wire, 6, through the helices 7 S of anelectro-magnct, 9, to another insulated binding-post, 10.

11 represents a short metal arm, bearing a stud, 12, of insulatingmaterial, and pivoted at 13, being limited in its motion on one side bya stop, 14, and on the other side by a stop, 15. The end of arm 11projects in the path of the projection or tooth a on the disk C of thesignaling mechanism, and when the naling mechanism is wound up the saidtooth a strikes said arm and swings it against its stop 1 L, as shown inFig. 1, and causes the insulating-stiul 12 to press the metal fingers NO in contact with each other; but as soon as the signaling mechanism istripped and the disk 0 started back, the arm 11 gradually falls back toits stop 15, and the metal springs N and 0 spring apart again out ofcontact. The local protecting-circuit 1.6 is connected to thebinding-posts 5 and 10, and includes a battery, 17, and any number ofcontact-making devi ces -such as 18 and ].9applicd to doors, wi ndows,blinds, &c., of the building or other place to be protected. Thecontinuation of the local circuit through the instrument has alreadybeen indicated as extending from binding-post 5, through wire 4, tospring-arm N, to spring-arm O, to wire 6, through the helices of theelectro-magnet-9, and thence back again to binding-post 10.

In front of the poles of the electro-magnet S) is an armature, 20,whichis secured to thclower end of a pivoted lever, 21, whose upper endoverlaps the lower end of the tripping-lever G, though normally heldaway from the same by the tension of a suitable spring, 22.

All the parts of the apparatus having been new described, its operationwill. be readily understood. \Vhen the apparatus is set for operation,the parts are in the position shown in Fig. 1., the signaling mechanismbeing wound up and held in check by the trippinglever G, and thespring-arms N O in the local circuit being held in contact. When, new,the local circuit is closed, by the bringing together of the contacts 18and 19, for instance, the cores of the electro-magnet 9 will bemagnetized and will attract their armature 20, thus causing the lever 21to rock the trippinglever G and set the signaling mechanism intooperation to turn in a signalat the central oifice. As the disk C of thesignaling meclr anism rotates, its tooth a releases the short pivotedarm 11, and the latter drops down upon its lower stop or stud, 15, thusreleasing the spring-arm 0 from contact with the arm N and opening thelocal circuit. From this it will be seen that the closing of thelocaljcircuit by a burglar, or from any other cause, will send a callfor assistance to the central oflice, and as soon as the signaling a)paratus has been set in motion it will automatically open the localcircuit again, and thus prevent wastage of the local battery.

Having thus described my invention, I claim as new 1. The combination,with an automatic signaling mechanism and a tripping device for holdingthe same in check, of a local protecting-circuit, including abatteryzandxan electro-magnet for releasing the tripping device upon theclosing of the local circuit, and means operated by the signalingmechanism for antomatically opening the local circuit again to preventwastage of the local battery, substantially as described.

2. The combination, with an automatic naling mechanism and a trippingdevice for holding the same in check, of the local protecting-circuit,including the battery and the clectro-magnet for releasing the trippingdevice upon the closure of the local circuit, the spring-arms in thelocal circuit, the pivoted lever normally holding the said spring-armstogether, and the tooth on the disk of the naling mechanism operatinguponthe pivot ed lever, substantially as described.

\VILLTAM F. "IlESlER.

\Vitnesscs:

llIELVIL'LE CHURCH, Faun F. (/H'I RCl-I.

